Tire width and wheel width question

This is kinnda a dumb one but I dont know the anwser so I have to ask... on a 33 12.50 15 (Or realy any 12.5 tire) will a 12 wide wheel make the tire taller or shorter? compared to a 10wide wheel
Ive though about this for wile but can see to figure it out I first though because the sidewalls will be staigt up and down that would make it taller but then I though about when you pinch them on a skinnyer wheel it might make them get tall.... So basically I just want to know what you guys know form experence /forums/images/graemlins/waytogo.gif

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